Android :: Select Or Click On Item In ListView?

As I mentioned in the email subject, I want to select an item (e.g. Department of Human Resource Management) in my ListView. And you can see that: I had try to use setClickable(true), setChoiceMode(ListView.CHOICE_MODE_SINGLE), setFocusable(true), setFocusableInTouchMode(true), no matter I use touch screen to click on the item or use the scroll ball on my mouse to select the item, it also doesn't work. Is there any mistakes in my coding? I hope someone can give me some ideas what I should do. because I am a beginner for developing Android application.

And the following is my coding: package com.example.abc;.............